<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>样式的优先级</title>
<style>
	div{ color : red; }
 	p{ color : green; }
	.active{ color : blue; }
</style>
</head>
<body>
<p class="active">这是一个段落</p>
</body>
</html>

